Derating - ABB ACS355 series User Manual

376 Technical data
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Derating

I : The load capacity decreases if the installation site ambient temperature exceeds
2N
40 °C (104 °F), the altitude exceeds 1000 meters (3300 ft) or the switching frequency
is changed from 4 kHz to 8, 12 or 16 kHz.
Temperature derating, I
In the temperature range +40 °C...+50 °C (+104 °F...+122 °F), the rated output
current (I ) is decreased by 1% for every additional 1 °C (1.8 °F). The output current
2N
is calculated by multiplying the current given in the rating table by the derating factor.
Example: If the ambient temperature is 50 °C (+122 °F), the derating factor is
%
100% - 1 · 10 °C = 90% or 0.90. The output current is then 0.90 · I
°C
Altitude derating, I
In altitudes 1000...2000 m (3300...6600 ft) above sea level, the derating is 1% for
every 100 m (330 ft).
For 3-phase 200 V drives, the maximum altitude is 3000 m (9800 ft) above sea level.
In altitudes 2000...3000 m (6600...9800 ft), the derating is 2% for every 100 m
(330 ft).
Switching frequency derating, I
The drive derates itself automatically when parameter
1 (ON).
Switching
frequency
4 kHz No derating
8 kHz I
2N
12 kHz I
2N
16 kHz I
2N
When parameter 2607 SWITCH FREQ CTRL
switching frequency towards the selected switching frequency
FREQ if the drive's internal temperature allows.
2N
2N
2N
U = 200...240 V
N
derated to 90%.
derated to 80%.
derated to 75%.
2607 SWITCH FREQ CTRL
Drive voltage rating
U = 380...480 V
N
No derating
I derated to 75% for R0 or to 80% for R1...R4.
2N
I derated to 50% for R0 or to 65% for R1...R4
2N
and maximum ambient temperature derated to
30 °C (86 °F).
I derated to 50% and maximum ambient
2N
temperature derated to 30 °C (86 °F).
= 2 (ON (LOAD)), the drive controls the
.
2N
2606 SWITCHING
=